[m-rev.] diff: update programming style in tests/hard_coded

[Julien Fischer]

Update programming style in tests/hard_coded.

tests/hard_coded/*.m:
     Update programming style, unless doing so would change
     the meaning of the test, in particular:

     - use '.' as a module qualifier in place of '__'
     - use {write,print}_line where appropriate
     - use if-then-else in place of C -> T ; E
     - use state variables in place of DCGs

tests/hard_coded/dir_test.m:
     Document what the expected outputs correspond to.

     Use a uniform module qualifier in the output.

tests/hard_coded/dir_test.exp*:
     Conform to the above change.

Julien.

(Diff attached.)
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